CuSO₄
Compound · Salt
Copper(II) sulfate
硫酸铜
Copper(II) sulfate (硫酸铜), formula CuSO₄, is a salt with a molar mass of 159.61 g/mol (CAS 7758-98-7). White when anhydrous; the familiar blue crystals are the hydrate; soluble in water; solution is blue.
Key facts
| Molar mass | 159.61 g/mol |
|---|---|
| Category | Salt |
| State at 25°C | Solid |
| CAS | 7758-98-7 |
Structure
Cu²⁺ [SO₄]²⁻
Anhydrous salt is white; the pentahydrate (CuSO₄·5H₂O) is blue
Physical properties
| Appearance | White when anhydrous; the familiar blue crystals are the hydrate |
|---|---|
| Melting point | — |
| Boiling point | — |
| Density | 3.60 g/cm³ (无水) |
| Solubility | Soluble in water; solution is blue |
Key reactions
CuSO₄ + 5H₂O → CuSO₄·5H₂O
Hydrates to a blue salt — a test for water
Fe + CuSO₄ → FeSO₄ + Cu
Iron displaces copper (activity series)
CuSO₄ + 2NaOH → Cu(OH)₂↓ + Na₂SO₄
Forms a blue Cu(OH)₂ precipitate
Main uses
- Agricultural fungicide (Bordeaux mixture)
- Electroplating and copper refining
- Pigments and chemical analysis
Hazard
ModerateToxic, especially to aquatic life; harmful if swallowed
Constituent elements
Data sources
Molar mass is computed from IUPAC (CIAAW) standard atomic weights; formula, properties and reactions can be verified on PubChem, NIST and Wikipedia. The CAS number is the substance's unique registry identifier. Educational reference only.